题目内容：
If the minimum payoffs of four different strategies A1, A2, A3, and A4 are –10, 15, 0, and –20 respectively, which strategy would a project manager choose, using the “maximin” or Wald criteria (risk avoide r)? （ ）A．Strategy A1
B．Strategy A2
C．Strategy A3
D．Strategy A4 A．策略 A1
B．策略 A2
C．策略 A3
D．策略 A4
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答案解析：